18.5.10.12 The ndbinfo memoryusage Table

The following table provides information about the columns in
the memoryusage table. For each column, the
table shows the name, data type, and a brief description.
Additional information can be found in the notes following the
table.

Column Name

Type

Description

node_id

integer

The node ID of this data node.

memory_type

string

One of Data memory or Index
memory, or (NDB 7.2.16 and
later) Long message
buffer.

used

integer

Number of bytes currently used for data memory or index memory by this
data node.

used_pages

integer

Number of pages currently used for data memory or index memory by this
data node; see text.

total

integer

Total number of bytes of data memory or index memory available for this
data node; see text.

total_pages

integer

Total number of memory pages available for data memory or index memory
on this data node; see text.

The total column represents the total amount
of memory in bytes available for the given resource (data memory
or index memory) on a particular data node. This number should
be approximately equal to the setting of the corresponding
configuration parameter in the config.ini
file.

Suppose that the cluster has 2 data nodes having node IDs
5 and 6, and the
config.ini file contains the following:

[ndbd default]
DataMemory = 1G
IndexMemory = 1G

Suppose also that the value of the
LongMessageBuffer
configuration parameter is allowed to assume its default (64 MB
in NDB 7.2.16 and later).